I'm a little fuzzy on pump technology, so I don't remember which does what. The common ones I've seen in homebreweries are the March (sp?) pump and the Little Giant. I think they're both in the Grainer catalog. What you want is one that doesn't mix oxygen with the wort and a food grade one that can take high temps. As I recall, finding one rated to 180F is easy, but finding one for 212F is near impossible. -- -- Michael Valentiner, Minneapolis, Minnesota mpv(a)yuck.net